Pi is equivalent to approx 3.1415926535....
Pi is used to find the circumference by multiplying it to the diameter or 2x the radius.
Pi is also used in many other math problems, but can also be used to crack codes, and locks. Any compination of letters or numbers can be found in Pi because it is a sequence that never ends. Example: If I have a passwork for my computer, 1369, If you have a device that could run Pi through the system, eventually those number, in that sequence, would be found in Pi and the password would be cracked!